[CXP] Adding missing quotation marks

Fixes issue https://github.com/MicrosoftDocs/azure-docs/issues/53901 and https://github.com/MicrosoftDocs/azure-docs/issues/51821

Author: asergaz

articles/iot-hub/iot-hub-live-data-visualization-in-web-apps.md

@@ -169,7 +169,7 @@ In this section, you provision a web app in App Service and deploy your code to
 3. Now add Application Settings for the environment variables that specify the IoT hub connection string and the Event hub consumer group. Individual settings are space delimited in the `-settings` parameter. Use the service connection string for your IoT hub and the consumer group you created previously in this tutorial. Don't quote the values.
 
    ```azurecli-interactive
-   az webapp config appsettings set -n <your web app name> -g <your resource group name> --settings EventHubConsumerGroup=<your consumer group> IotHubConnectionString=<your IoT hub connection string>
+   az webapp config appsettings set -n <your web app name> -g <your resource group name> --settings EventHubConsumerGroup=<your consumer group> IotHubConnectionString="<your IoT hub connection string>"
    ```
 
 4. Enable the Web Sockets protocol for the web app and set the web app to receive HTTPS requests only (HTTP requests are redirected to HTTPS).